Fixes for multiple input writers.
Fixes for multiple input writers.

mspark93/VTK,johnkit/vtk-dev,SimVascular/VTK,demarle/VTK,cjh1/VTK,msmolens/VTK,sumedhasingla/VTK,cjh1/VTK,mspark93/VTK,hendradarwin/VTK,sumedhasingla/VTK,mspark93/VTK,hendradarwin/VTK,biddisco/VTK,collects/VTK,msmolens/VTK,keithroe/vtkoptix,hendradarwin/VTK,Wuteyan/VTK,arnaudgelas/VTK,aashish24/VTK-old,SimVascular/VTK,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,collects/VTK,Wuteyan/VTK,jmerkow/VTK,msmolens/VTK,candy7393/VTK,berendkleinhaneveld/VTK,candy7393/VTK,arnaudgelas/VTK,sumedhasingla/VTK,demarle/VTK,naucoin/VTKSlicerWidgets,demarle/VTK,aashish24/VTK-old,daviddoria/PointGraphsPhase1,berendkleinhaneveld/VTK,jmerkow/VTK,johnkit/vtk-dev,sgh/vtk,candy7393/VTK,jeffbaumes/jeffbaumes-vtk,ashray/VTK-EVM,candy7393/VTK,biddisco/VTK,keithroe/vtkoptix,sumedhasingla/VTK,biddisco/VTK,sgh/vtk,ashray/VTK-EVM,gram526/VTK,keithroe/vtkoptix,demarle/VTK,sankhesh/VTK,Wuteyan/VTK,sankhesh/VTK,biddisco/VTK,daviddoria/PointGraphsPhase1,sankhesh/VTK,collects/VTK,gram526/VTK,hendradarwin/VTK,hendradarwin/VTK,sgh/vtk,berendkleinhaneveld/VTK,spthaolt/VTK,cjh1/VTK,demarle/VTK,demarle/VTK,gram526/VTK,SimVascular/VTK,Wuteyan/VTK,arnaudgelas/VTK,spthaolt/VTK,sankhesh/VTK,biddisco/VTK,arnaudgelas/VTK,aashish24/VTK-old,daviddoria/PointGraphsPhase1,ashray/VTK-EVM,candy7393/VTK,hendradarwin/VTK,ashray/VTK-EVM,cjh1/VTK,ashray/VTK-EVM,aashish24/VTK-old,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,arnaudgelas/VTK,jmerkow/VTK,gram526/VTK,collects/VTK,SimVascular/VTK,ashray/VTK-EVM,sgh/vtk,keithroe/vtkoptix,demarle/VTK,mspark93/VTK,gram526/VTK,jmerkow/VTK,daviddoria/PointGraphsPhase1,candy7393/VTK,cjh1/VTK,sumedhasingla/VTK,keithroe/vtkoptix,spthaolt/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,sankhesh/VTK,jmerkow/VTK,ashray/VTK-EVM,mspark93/VTK,jeffbaumes/jeffbaumes-vtk,gram526/VTK,johnkit/vtk-dev,collects/VTK,arnaudgelas/VTK,sumedhasingla/VTK,candy7393/VTK,msmolens/VTK,daviddoria/PointGraphsPhase1,naucoin/VTKSlicerWidgets,jmerkow/VTK,msmolens/VTK,msmolens/VTK,spthaolt/VTK,biddisco/VTK,jeffbaumes/jeffbaumes-vtk,keithroe/vtkoptix,daviddoria/PointGraphsPhase1,jeffbaumes/jeffbaumes-vtk,demarle/VTK,candy7393/VTK,SimVascular/VTK,sgh/vtk,sankhesh/VTK,jmerkow/VTK,Wuteyan/VTK,Wuteyan/VTK,mspark93/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,sankhesh/VTK,sgh/vtk,ashray/VTK-EVM,SimVascular/VTK,SimVascular/VTK,biddisco/VTK,gram526/VTK,msmolens/VTK,jeffbaumes/jeffbaumes-vtk,cjh1/VTK,aashish24/VTK-old,keithroe/vtkoptix,msmolens/VTK,mspark93/VTK,jmerkow/VTK,johnkit/vtk-dev,aashish24/VTK-old,spthaolt/VTK,sankhesh/VTK,spthaolt/VTK,keithroe/vtkoptix,SimVascular/VTK,johnkit/vtk-dev,Wuteyan/VTK,mspark93/VTK,jeffbaumes/jeffbaumes-vtk,naucoin/VTKSlicerWidgets,naucoin/VTKSlicerWidgets,gram526/VTK,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,collects/VTK,hendradarwin/VTK,spthaolt/VTK